Op-amp siren sound using ic 741

This circuit is the sound generator super siren, for use be alarm signal get by live frequency generator circuit that use , op-amp circuit. The principle works to are while still no press switch S1 will still have no the loud sound comes out from a loudspeaker SP1. When do pressure switch S1 then liberate C3 do something charge full until while press switch S1 and discharge go out. When liberate switch S1 come in at R7. Which perform in something limit current come in at 3 Non inverting legs of IC1a. By IC1, D1, D2, C1, C2 and R5 build be sound generator signal circuit then export come to way pin 6 of IC1a come to reach at pin 3 (Noninverting) of IC1b. By have R1 and R2 build be Dectector circuit. For do fining level has signal then signal to come out the way pin 7 of IC1b which will have flowing through comes in at pin B of Q1 for do something bias give Q1 bias. When Q1 work then make SP1 make a noise loud come out and make a noise poor loud C3 discharge be finished SP1 then stop make a noise loud.

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Engine Control Module And Ignition Coil Wiring Diagram Of 1993 VW Passat

The schematic we are about to show you is the engine control module and ignition coil wiring diagram of the 1993 VW Passat. Make sure to read this engine control module and ignition coil wiring diagram before you make any changes on your VW Passat wiring system. The parts we will find inside the wiring schematic is like: heated oxygen sensor, fuse/relay panel, starter interlock/backup light relay, engine coolant temp sensor, throttle position sensor, aut control unit, data link connection, knock sensor, change-over valve, secondary air injection motor, secondary air injection relay, battery, ignition coil, spark plug, hall generator, engine control module, RPM sensor, A/T control unit, and heated oxygen sensor control module. (click image to enlarge)

engine control module and ignition coil wiring diagram of 1993 vw passat e1303315349669 Engine Control Module And Ignition Coil Wiring Diagram Of 1993 VW Passat

Categories: Automotive.
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Transformerless power supply from 220V with LM2575

Power supply with LM2575 300x126 Transformerless power supply from 220V with LM2575

Is often required to supply electricity to the consumer low voltage 220V.  You can use an external adapter - but it’s bad, and to reduce the size of the device requires a power supply located in the device.

This 5v power supply used LM2995 to the converter circuit which can be connected directly to 220V.  To do this,  AC converted to DC voltage across the diode bridge VD1,  and then lowered to 40V.  Above 40 V we should not use it,  due to the fact that the LM2995 maximum input voltage must not exceed 45V.

Transistors T1 and T2 form a pulsating stress amplitude up to 40V, which depends on the zener diode D1. This pulsating voltage is applied to the capacitor C1, which is slightly smoothed. Next on the chip down-converter output voltage is stabilized, defined applied chips : so for LM2575-5 5V it will be equal.  Schottky diode D2, L1, C2 and C3 are the standard strapping of the chip.

Categories: Power Supply Circuits.
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Regulator 15V 400mA by 748 and 2N3055

Regulator 15V 400mA by 748 and 2N3055
Today try come to see linear regulator 15volt 400mA Circuit. It is use IC op-amp IC748 perform control Voltage Regulator 15V. by have ZD1 5.1V be the referable voltage. For Transistor 2N3055 , perform enlarge current tallly go up and Q3-2N3904 help protect something through the circuit. This circuit can give Current get about 400mA only. Be regarded as the circuit experiences that interesting help give understand the system Voltage Regulator well. The detail is other , a friend has seen in the circuit please sir.

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Gitar Ibanez 2008 ART Ibanez Wiring Diagram The following s

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2008 ART Ibanez Wiring Diagram

The following schematic shows 2008 ART Ibanez Wiring Diagram which consists of neck pickup, bridge pickup, neck volume 50K-B, bridge volume 50K-B, 3way-toggle, tone, output, and battery box.

(source: www.ibanez.com)

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Dual limit comparator with LM709

This voltage comparator circuit gives a positive output when the input voltage is a positive or negative more than 8.5V.

But in between that the output is negative voltage.
The positive limit point is defined by the ratio of R1, R2, and the negative point by R1, R3.
The forward voltage drop across the diodes must be allowed from it before.
The output may be inverted by reversing the inputs to the operational amplifier IC1, that LM709 is used without frequency offset.

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12V Battery charger using UJT

This is an automatic 12V battery charger circuit, they uses the power SCR and UJT are main parts.
And they will not work except the battery 12V to be charged with right polarity, so prevent errors as well. The battery voltage controls the charger and when the battery is fully charged, the charger will not supply current to the battery anymore.

The battery charging current through the SCR MCR3818, when it is triggered into the conducting state by the UJT 2N4851 relaxation oscillator. And the oscillator is only activated when the battery voltage is low. Vb2b1 of the UJT derive the battery voltage that to be charged, and since Vp = Vd = Vb2b1 ; the higher Vb2b1, the higher Vp. When Vp exceeds the breakdown voltage of the zener diode ZD1, the UJT will stop to work and the SCR1 will not conduct.
T1 =Primary – 30 turn #22 , Secondary – 45 turns #22
R1 = Series resistance to limit current through SCR so use MCR3818 at 20 amps.
The setting VR1, we can charge the battery as needed.

Categories: Charger Circuits.
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Simple Smart Nicad (NiCd) Battery Charger

In application that demand for high current, Nicad (NiCd) rechargeable battery still has the unbeatable performance compared to NiMH and Lithium battery. The charger circuit here is smart in the way it handle the wrong polarity of the battery placement.

smart nicd circuit schematic

The core of this battery charger
circuit is the Q2, configured a constant current source for the
battery. LED D3 and zener diode D2 make the voltage applied to Q2 base
constant, therefore the voltage and the current across R1 is constant.
Using the value shown in the schematic diagram, the current flow through
R1 will be constant at around 50 mA.

You can see that the base of Q2 is
supplied by R3, which is controlled by Q1. Look at the Q1 base, it’s
controlled by the battery voltage, so Q1 won’t works if the battery is
placed in wrong polarity. Just note that although this battery charger
could charge four Nicad battery (in series), it can’t detect if one
battery placed in wrong polarity while two or three other batteries are
in right polarity. A small transformer, a bridge diode, and an
electrolytic capacitor is needed to supply this circuit. Remember to
provide a sufficient heat sink for Q2. This circuit will work as long as
the battery is not completely discharged, because its weak voltage is
needed to trigger the Q1 transistor.

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Blackbox Sustain, An Audio Effect for Electric Guitar

Sustain effect in electric guitar is similar with compressor effect. The purpose of this effect is to make the note last longer when the string is plucked. The mechanism is actually work by controlling an amplifier gain, where the gain is automatically increased when the note fade out, therefore the note will be sustained to be heard until the actual sound almost completely gone.

blackbox sustain circuit schematic

You need a red LED and a small LDR
(light dependent resistor) to be assembled and protected in a lightproof
case. Select a small LDR and Red LED, set their layout that the LED ray
directly expose the sensitive surface
of the LDR, protect the LDR and the LED with lightproof glue, case, or
anything can be used to avoid the LDR receiving any light other than
from the LED. The LDR will be about 100-200 K ohm in dark condition and
about 1-5K? in day light exposure. You can use BC549 transistor type if
you can’t find BC209 type in your local store.

Categories: Audio Circuits.
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10 Watt Car Audio Amplifier

TDA2003 is my favorite audio amplifier integrated circuit chip in 10 Watt class. All you need is just adding few passive components and your amplifier will be ready. You can even amplify ultrasonic range if you wish to abuse its usage, just to convince you that
this chip is more than enough to handle any range of audio signal.
Although many manufacturer produce this TDA2003 chip, in general, this
various chip from various manufacturer normally comply with these
following features: Short circuit
protection between all pins, High current output ( up to 3 A), Built-in
Over temperature protection, and Low harmonic and crossover distortion.

tda2003 amplifier circuit schematic

Figure 1. Typical TDA2003 Audio Amplifier Application

tda2003 amplifier bridge circuit schematic

Figure 2. TDA2003 Audio Amplifier in Bridge Configuration

Figure 1 Show the circuit schematic diagram for typical application, can be operated for 12-18 DC power supply. Figure 2 show the application in bridge mode, giving more output to the loud speaker.

Categories: Radio Circuits.
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